Im not going to comment or speculate on that individual situation but suicide is usually caused by a pattern of unhealthy cognition that can be changed. If an entreprenuer is considering suicide I would strongly advise them to tackle their depression and anxiety directly through professional therapy rather than dropping entreprenuership with the assumption it will cure their depression. In other words entreprenuership is not the direct cause of depression although it may somewhat exacerbate a person's depression who is more susceptible to it (just like any other lifestyle situation could).